In this paper, a direct power control (DPC) of a wind-turbine-driven doubly fed induction generators (DFIGs) under
unbalanced network voltage conditions is studied. Variations of the stator output active, reactive and electromagnetic
powers are fully deduced in the presence of negative sequence supply voltage. The rotor side converter is controlled on
the basis of DPC to eliminate the electromagnetic torque oscillations at double supply frequency under unbalanced
stator supply. The rotor voltage references estimation requires only simple calculations without any integral operation.
The proposed control scheme removes rotor current regulators and the decomposition processing of positive and negative
sequence rotor currents. The performance of the proposed and conventional DPC schemes is compared under the same
operating conditions. Simulation results using Matlab/Simulink are carried out for a 1.5MW DFIG wind generation system
to show the validity of the proposed scheme during unbalanced voltage supply.